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FindThreads: Honor THREADS_PREFER_PTHREAD_FLAG when pthread is found in libc

Mattias Ellert requested to merge ellert/cmake:honor-THREADS_PREFER_PTHREAD_FLAG into master

The -pthread flag tells the compiler/linker to link to additional libraries needed for thread support (e.g. libatomic on riscv64). The flag therefore should be used if requested using THREADS_PREFER_PTHREAD_FLAG also when the pthread functions are found in libc.

Topic-rename: FindThreads-libc-pthread-flag

Edited by Brad King

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